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Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.

Key to Alstonia

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1 Leaves in whorls of 3-4; corolla (tube + throat) 4-6.5 cm long
1 Leaves in whorls of 4-8; corolla (tube + throat) 0.7-1.0 cm long
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